Unable to inject service/Bean exposed by JiraFishEye plugin

I have declared the below in my atlassian-plugin.xml and the component is getting injected into my custom plugin class. However I get the Error " java.lang.NoClassDefFoundError: com/atlassian/jirafisheyeplugin/domain/FishEyeInstance" when I try calling methods on FishEyeInstanceStore to get the FishEyeURL.